AW: Using a Kerberized application outside the Kerberos Realm
jaltman2 at nyc.rr.com
Tue Aug 22 18:32:02 EDT 2006
If Alice can share a key with the KDC then Alice can be issued a service
principal name and act as part of the realm.
Florian Frankenberger wrote:
> Thank you, Mike.
> In my case, Alice isn't running in a domain at all. That's why I have to implement the check for authenticity on Alice's side in my own way. So what about the idea of having the service ticket encrypted with the symmetric key that only the KDC and Alice know? Doesn't this mean a kind of secure proof of authentcity to Alice if the ticket passed by Bob can be decrypted with the shared secret key?
> Or is it simply impossible to get a service ticket for a service that doesn't exist in this or any other domain?
> -----Ursprungliche Nachricht-----
> Von: Michael B Allen [mailto:mba2000 at ioplex.com]
> Gesendet: Montag, 21. August 2006 20:49
> An: Florian Frankenberger
> Cc: kerberos at mit.edu
> Betreff: Re: Using a Kerberized application outside the Kerberos Realm
> On Mon, 21 Aug 2006 18:40:28 +0200
> "Florian Frankenberger" <ffrankenberger at ai-ag.de> wrote:
>> My problem is that Alice is not in the domain in which the KDC is running. To be more precise, the KDC and the service Alice are set up in different network environments and thus do not know each other.
>> Is it possible to create a kerberized service that is not part of the Kerberos realm? If yes, what do I have to do?
> Alice and Bob have to be in the same realm or in separate realms that
> have a trust established between them. Otherwise the is no basis for
> establishing trust between Alice and Bob. Kerberos is a "thrid party
> authentication system" so there needs to be someone both principals trust.
>> I thought of sharing the symmetric service key between the KDC and Alice. To do so, I tried to create the service Alice with ktpass, give the so created encryption key to Alice and let Alice decrypt the service tickets, that will be delivered by Bobs later.
>> Is this procedure possibly in theory? Does anyone know how to obtain the service ticket by using JAAS? I only managed to get the TGT.
> If Bob requests a ticket for ALICESVC/apps22.ai-ag.de at AI-AG.DE then
> even if Bob is bob at AI-AG.US he should have no problem looking up the
> KDC for AI-AG.DE using DNS and getting a ticket per usual. But a trust
> relationship would be required between AI-AG.DE and AI-AG.US.
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